Lock.



W. E. SPARKS.

LOCK.

APPLICATION FILED MAY 1. 1914.

L11 1 5m Patented June 1, 1915.

IIVVTUR IHE NORRIS PETE/PE 50.. PHOTO-LITHO WASHINGTON, D. c,

OIQ.

VTILLIAM E. SPARKS, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO SARGENT 8:COMPANY, OF NEW HAVEN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

LOOK.

Specification of Letters Patent.

Patented June ll, 1915.

Application filed May 1, 1914. Serial No. 835,708.

To all whom it may concern.

Be it known that I, WILLIAM E. SrARKs, a citizen of the United States,residing in the city and county of New Haven and State of Connecticut,have invented certain new and useful Improvements in Locks, of which thefollowing is a full, clear, and exact description.

This invention relates to door locks, and more particularly to looksintended for communicating door rooms in hotels. In locks of this kind,there are usually two thumb bolts operable only from the respectivesides of the door, and a key bolt for locking the door, irrespective ofthe thumb bolts, so that the communicating door may be locked by thebell boy, or other authorized person having the proper key, againstopening of the door by unauthorized persons not having a key fitted tothe lock.

The primary object of the present invention is to provide simple andeffective means for throwing back one, or both, of the thumb bolts atthe same operation of the key which retracts the key bolt, so that thedoor may be unlocked from either side by an authorized person having akey without the necessity of manipulating one, or both, of the thumbbolts separately from the key bolt.

To this and other ends, the invention con sists in certain improvementsin a lock of the type set forth, as will be pointed out more fullyhereinafter.

In the accompanying drawing, Figure 1 is a fragmentary elevation of alock embodying my improvements, with the cap plate removed, all of thebolts being in a retracted position. Fig. 2 is a similar view, with thekey bolt and one thumb bolt protracted,

showing the key in position to retract both of said bolts. Fig. 3 is asimilar view, showing how the protracted thumb bolt is retracted by thekey, and Fig. 4 is a reverse view of the lock, with the parts in theposition shown in Fig. 1.

Referring to the drawing, the lock case 5 is of usual type, and mountedin said case are a key bolt 6 and two thumb bolts 7 and 8. Bypreference, the key bolt will be located above the thumb bolts, asshown, and the thumb bolts will have their shanks 7, 8, located side byside, but these features are not important. The thumb bolt 8 is adaptedto be operated by a rollback 9, actuated by the spindle (not shown) of athumb turn at one side of the door. Similarly, the thumb bolt 7 isadapted to be operated by a rollback 10 actuated by the spindle (notshown) of a thumb turn at the other side of the door. Lugs 7 8 projectupward from the shanks of the respective thumb bolts, and are adapted tobe engaged by an elbow lever 11, pivoted in the case on a post 12. Thelever 11 has a depending arm 13 with a laterally projecting lug 14:adapted to engage the lugs 7 8 of the respective thumb bolts. Anotherarm 15 of the lever 11 extends into the path of rotation of the bit 16of a key insertible into a keyhole 17 in the case, for the purpose ofactuating the key bolt 6. The key bolt is usually provided with aplurality of tumblers, but in the present instance I have illustratedonly a single tumbler l8 cooperating with the key bit 16, and with thestump or fence 19 in the usual manner.

An upward extension 20 on the elbow lever 11 passes behind the shank ofthe key bolt, as shown in Fig. 4., and is engaged by a spring 21, coiledabout a post 22. The spring 21 acts on the lever 11 in such a manner asto hold the arm 15 normally in the path of rotation of a key inserted inthe keyhole 17 for the purpose of actuating the key bolt.

Suppose the parts to be in the position shown in Fig. 2, with the keybolt protracted, and with one of the thumb bolts, for example the thumbbolt 7, also protracted. When the thumb bolt is protracted, its lug 7brings up in close proximity to the lug 14 on the lever 11. The keybeing inserted in the keyhole 17 for the purpose of retracting the keybolt, the key bit, when rotated in the proper direction to retract thekey bolt, will first strike the arm 15 of the lever 11, and therebyswing said lever on its pivot 12 carrying the lug 7 to the right withreference to Fig. 2, and thereby retracting the thumb bolt 7, as shownin Fig. 3. As the bit continues to rotate, the arm 15 of the thumb boltretracting lever passes out of engagement with said bit as the thumbbolt is fully retracted (Fig. 3), and the bit then engages the tumblerof the key bolt in the usual manner and retracts said bolt. Thus, by asingle rotary movement of the key, the door is free to be opened withoutthe necessity of manipulating the thumb bolt independently of the keybolt.

As the key bolt is retracted, a shoulder 23 on said bolt engages theextension 20 on the lever 11 and moves said lever back to the initialposition, as shown in Fig. '1.

' thumb bolts are protracted from the respective sides of the door, theyWill both be retracted simultaneously by the lever 11 as the latter isactuated by the key of the key bolt.

Various modifications of the construction described may be adoptedWithin the scope 2. In a lock, a key bolt, a thumb bolt, :1- key foroperating the key bolt, and a lever actuated by said key to retract thethumb bolt, prior to the retraction of the key bolt by said key;substantially as described.

3. In a look, a pair of thumb turn bolts, and a common retracting levertherefor operated by direct engagement with a key; substantially asdescribed.

l. In a look, a key bolt, a key to operate the same, a pair of thumbturn bolts, a reracting lever common to both of said thumb turn bolts,and a part on said retracting lever extending into the path of rotationof the key for said key bolt at such a point that either, or both, ofthe thumb bolts is retracted by the key prior to the key bolt;substantially as described.

In Witness whereof, I have hereunto set my hand on the 29th day ofApril, 1914.

WILLIAM E. SPARKS.

Witnesses:

MABEL A. Bussn, ADELE M. LONGSTEIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

- Washington, D. C.

